I haven't personally shared my Samsung Calendar with another person's phone however looking at a general search I have read a few possible options @Toad1903
First one is https://www.syncgene.com/share-samsung-calendar-with-another-phone
The second is look at the section titled
Daily Driver > Samsung Galaxy s²² Ultra 256Gb in Phantom Black.The advice I offer is my own and does not represent Samsung’s position. I'm here to help. " This is the way. "